Oil-well pump



Aug. 5 192%.

C. C. SCHARPENBERG ET AL OIL WELL PUMP Filed Nov. 2, 1923 J rm S Him. a 05M 3 ZZV C B Patented Aug. 5, 1924.

UNITED STATES CHARLES C. SCHARPENBERG, or naxnnsrmnn', AND LEROY e. earns, or wmrrmn,

. CALIFORNIA.

OIL-Wm PUMP.

Application filed November 2, 192a. seria'i No. 672,407.

To all whom it may oorwe'm:

Be it known that we, CHARLES C. Senna-- PENBERG and LEROY G. GATES, citizens of the United States, residing at Bakersfield and Whittier, res ectively, in the counties of Kern and Los fornia, have invented certain new and useful Improvements in Oil-Well Pumps, of which the following is a specification.

Our invention relates to oil well pumps of the plunger type.

The object of our invention is to provide a pump which is more eflicient and economical in operation, and less subject to wear, than pumps of the types now in common use. We attain this object, broadly, by providing a pump having less friction and less leakage past the plunger than the usual pumps, and in which the abrasive ac- .tion of any sand. or other hard particles which may be suspended in the oil is reduced to a minimum. We further provide a ump in which the barrel need not be pu led for renewal when slightly worn, the plunger being the only part which it is necessary to replace. this feature, considerable time is save over. the present practise of pulling both plunger and barrel when worn.

It is to be understood that the construction herein shown and described ma be varied, within the limits of the claims ereto appended, without departing from the spirit of the invention as expressed in said claims.

' A preferred embodiment of our invention will now be fully described with reference to the accompanying drawing, in

which the figure is a longitudinal section of our improved oil well pump.

In the drawing, the reference numeral 1 designates the tubingstring, and 2 is the sucker rod. The plunger 3, which is secured to the sucker rod 2 by the usual upper, or traveling valve 4, may be of any suitable and well known. type having a smooth exterior surface. For purposes of illustration, we have shown a familiar type of lunger, employing a garbutt rod 5 to pul the lower, or standing valve 6, which is seated, as usual, in the standing valve barrel 7.

geles and State of Cali-- {3 and to the lower end of which the standing valve barrel 7 is secured, as shown; a

working barrel 1O fitted within the upper portion of said shell; and a free barrel, or sleeve 11, of larger interior diameter than said working barrel 10, fitted within the low r Portion of said shell. Thefree '1 barrel or sleeve :11 may be made-in sections as shown," if desired. Both the working barrel l0 and the sleeves 11 are close fits w1thin t he. outside tube 9, and a're'locked in position by being clamped endwise between the coupling 8 and the standing valve barrel 7. The working barrel 10 is considerably shorter than the plunger 3, in fact, its length is less than the length of the plunger minus the length of the stroke, so that the ends of the plunger, even at the extreme limits of the stroke, project beyond the ends ofsaid working barrel.

The working barrel 10 is a close sliding fit upon the plunger 3, and is preferably formed of some relatively hard 'wear' resisting material such for example as chilled cast iron or manganese steel. On account of its short length, said working barrel can be machined and ground toa very accurate fit upon the plunger 3, and is little subject to distortion from changes of term perature-or other causes. This close fit of the plunger 3 within the working barrel 10 not only reduces back leaka e at. this point to a minimum, but also ass sts in the which might cause abrasion and excessive wear on both plunger and barrel. If de-- exclusion of sand or other foreign matter tween the plunger and barrel and causing.

abrasion and wear. We do not wish to restrict ourselves to the particular form of bevel shown in the" drawing, as other forms may be satisfactory. The coupling member 8 and the upper end portion of the free barrel or sleeve 11 are provided with i as of shoulders at the ends of the -stroke.

interior annular grooves 14, preferably of inclined and rounded cross sectional contour and mer ing into the beveled ends 13 of the working barrel 10. Said grooves roduce outwardl swirling eddy currents in the, oil, is indicated by the curved arrows, which tend to carry sand and other solid particles awa from the surface of the plunger 3, there y reventing such particles from working in etween the plunger and the working barrel.

It will now be seenv that the friction between the plunger 3 and the working barrel 10 is reduced to a minimum by the shortness of said barrel and the accuracy with which it can be made to fit said plunger, and further, if desired, by the insertion of the soft metal packing rings 12. Back leakage past the plunger is also reduced by said accuracy, and by the packing rin s 12. Wear of the plunger 3 and working arrel 10 is reduced to a minimum partly by this same accuracy, and partly by the beveled ends 13 and annular grooves 14, all of which combins to exclude abrasive particles from the barrel 10. Furthermore, said barrel may be made of relatively hard metal, as stated. By reason of the short length of the barrel 10, and the fact that the ends of the plunger 3 are alwa s outside said barrel, even at the extreme imits of the stroke, such wear as does occur in said barrel is evenl distributed throughout its length, without t e formation On this account there is no necessity for pulling the barrel for replacement. When sufiicient wear has occurred, the sucker rods and plunger only are pulled, and a new plunger, of sli htly larger diameter, is substituted, the barre 10, having worn evenly, being still capable of eflicient operation. Thus agreat saving of time and labor is effected over the present methods, where both plungerand arrel must be ulled for replacement. The reduction of frlction and wear also effect a saving in the power used to operate the pump, and in the cost of repairs.

We claim:

1. An oil well pump comprising a shell; a working barrel secured within said shell and extendin for a portion of the length thereof, said s ell having an annular interior groove of curved cross sectional contour adjacent each end of said barrel; and a fitting closely within and operating t rough said barrel, said plunger having a length greater than that of said barrel.

- 2. An oil well pump comprising a shell; a working barrel secured within said shell and extending fora portion of the length thereof, said barrel having a bore and having its end faces tapered inwardly toward said bore, and said shell having an annular groove adjacent each end of said barrel, one wall of each groove merging into each end face of said barrel; and a plunger fitting closely within and operating through said bore, said plunger having a length greater than that of said barrel.

8. An oil well pump comprising a shell; a working barrel formed of relatively hard metal secured within said shell and extending for a portion of the length thereof; a

packing ring of relatively soft metal inplunger 1 serted in the bore of said barrel; and a.

plunger fitting closely within and operating through said bore, said plunger having a length greater than that of said barrel.

4.. An oil well pump comprising a barrel having a portion of its length of reduced interior diameter and provided with an annular interior groove of curved cross sectional I contour adjacent each end of said reduced portion; and a plunger, of greater length than said reduced portion, fitting closely therein and operating therethrough.

5. An oil well pump comprising a barrel having a portion of its length of reduced interior diameter, said reduced portion having a bore and its end faces being tapered.

inwardly toward said bore, and said barrel being provided with an annular interior groove adjacent each end of said reduced portion, one side of each groove merging into each tapered end face of said reduced portion; and a plunger, of greater length than said reduced portion, fitting closely therein and operating therethrough.

6. An oil well pump comprising a barrel formed of relatively hard metal and havin a portion of its length of reduced interior diameter; a packing ring of relatively soft metal inserted in the bore of said reduced portion; and a plunger, of greater length than said reduced portion, fitting closely therein and operating therethrough.

7. An oil well pump comprising a shell; a coupling member for attaching said shell to the well tubing strin a working barrel secured within said s ell, said coupling member having an annular groove adjacent the upper endof said barrel; a sleeve, of larger interior diameter than said barrel, secured within said shell below said barrel, said sleeve having an annular groove adjacent the lower end of said barrel; and a plunger fittin closely within and operating through said arrel.

nae

5 greater interior diameter S. An oil Well pump comprising a shell adapted for connection with the Well tubing string; a Working barrel positioned within the upper portion of said shell; a sleeve, of than said barrel, positioned within the lower end of said shell; and a plunger fitting closely within and operating through said barrel, the lower end of said plunger extending within said sleeve.

In testimony whereof we have signed our 10 names to this specification.

CHARLES C. SOHARPENBERG. LEROY G. GATES. i 

